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03-17-2021, 11:01 PM
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#1
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Member
Join Date: Aug 2019
Location: CA
Posts: 49
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Water heater has very low output with hot water
I have a 10 gallon water heater in my class A RV.
Heats the water just fine, but at the output of hot water nozzel.,, just a drizzle. This is at the output of the water heater. A hot drizzel, but a drizzle. Input city water is normal pressure, and cold water pressure is normal. Same issues with city water off, and pump on. Any suggestions will help.
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03-17-2021, 11:30 PM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,449
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Did you see my note on your other post about a back flow valve in the fitting on the water heater ?
Could you post a picture of the plumbing on the back of the heater , so I can see if any potential problems exist. 
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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03-17-2021, 11:48 PM
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#3
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Senior Member
Join Date: Aug 2010
Posts: 2,772
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If you have an Atwood Hester it may have a mixing valve on the back. It can start to fail and cause a decreased hot water flow. You might particularly notice an immediate good flow switching quickly to inadequate flow. I just had the mixing valve removed as there was not a new one available at that time. We just do the mixing at the faucet. WARNING this can be dangerous.
__________________
Terry & Alice
2006 Bounder 38L DP
2012 GMC Terrain
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03-18-2021, 07:24 PM
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#4
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Member
Join Date: Aug 2019
Location: CA
Posts: 49
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cannot get to the back of it, all enclosed, so I did sort-of solve the problem. I disconnected the hot water outlet hose, and put 40 1bs of air pressure into it from an air compressor. solved the problem for now.
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03-18-2021, 07:26 PM
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#5
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Member
Join Date: Aug 2019
Location: CA
Posts: 49
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used an air compressor, and squirted about 40 1bs of air into the hot water outlet hose. solved the problem for now..thanks for the info though.
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03-19-2021, 09:15 PM
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#6
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Member
Join Date: Aug 2019
Location: CA
Posts: 49
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lasted 3 days now back to low flow..sheesh!
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03-19-2021, 09:23 PM
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#7
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Senior Member
Join Date: Nov 2015
Posts: 26,820
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Quote:
Originally Posted by lancedal
lasted 3 days now back to low flow..sheesh!
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That is because the check valve is Cheap Plastic junk that clogs up/fails
Gut the internals...install a Sharkbite Shutoff valve and be done with it
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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03-19-2021, 09:25 PM
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#8
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Senior Member
Alpine Owners Club
Join Date: Oct 2019
Location: Hoodsport Wa
Posts: 3,132
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You probably have lots of calcium in the hot water tank. One big chunk will cause this. Let the tank cool, relieve the pressure, remove the anode (drain) plug and rinse out the tank well. Back flush the outlet line also.
And check the faucet screens, probably also full of calcium too.
And yes, those check valves are junk. Bypass it.
Good luck.
__________________
2000 Alpine 36 FDS #74058
04 Jeep Wrangler TJ
"On the road to find out..."
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03-19-2021, 09:43 PM
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#9
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Member
Join Date: Aug 2019
Location: CA
Posts: 49
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thanx
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03-19-2021, 09:46 PM
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#10
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Member
Join Date: Aug 2019
Location: CA
Posts: 49
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did not see your post, what is the title of the post?
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03-19-2021, 10:03 PM
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#11
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Member
Join Date: Aug 2019
Location: CA
Posts: 49
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what danger is there in bypassing the mixing valve...really hot water at the tap I assume?
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03-19-2021, 10:27 PM
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#12
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Member
Join Date: Aug 2019
Location: CA
Posts: 49
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how do I post pictures?
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03-19-2021, 10:28 PM
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#13
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Member
Join Date: Aug 2019
Location: CA
Posts: 49
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what issues will I have If I just replace it with a shark bite fitting?, in essence removing the back flow fitting totally...correct?
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03-19-2021, 10:30 PM
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#14
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Member
Join Date: Aug 2019
Location: CA
Posts: 49
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what issues will I have if I bypass it?
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Linear Mode
